Pick out the wrong statement ?

A. Longitudinal fins are used in extended surface heat exchangers, when the direction of fluid flow is parallel to the axis of the tube

B. In a shell and tube heat exchanger, the shell pressure drop is maximum for orifice baffles

C. Superheated steam is preferably not used for process heating because of its low heat transfer film co-efficient

D. S.I. unit of fouling factor is Watt/m2.K

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